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Photosynthesis

Photosynthesis. The beginning of all food on Earth. Sunlight – the beginning. Photoautotrophs. Autotrophs Heterotrophs. 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2. Location, Location, Location. Leaves Mesophyll Stomata Chloroplasts Stroma Thylakoids Grana. What’s Happening?.

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Photosynthesis

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  1. Photosynthesis The beginning of all food on Earth

  2. Sunlight – the beginning

  3. Photoautotrophs Autotrophs Heterotrophs 6CO2 + 6H2O  C6H12O6 + 6O2

  4. Location, Location, Location • Leaves • Mesophyll • Stomata • Chloroplasts • Stroma • Thylakoids • Grana

  5. What’s Happening? • Splitting of Water • Redox • Light Reactions • Calvin Cycle

  6. Light Reactions: Overview • Convert solar to chemical energy • NADP+ = acceptor • Source = water • Chemiosmosis • ATP formation via photophosphorylation • Chlorophyll, in thylakoids

  7. Carbon Fixation • CO2 into CH2O (reduction) • Energy from: • NADPH • ATP • Calvin Cycle • Stroma

  8. Light Reactions: Up Close Spectrophotometer

  9. Light Reactions: Up Close Why leaves are green… Absorption spectrum Chlorophyll a Carotenoids

  10. Light Reactions: Photosystems

  11. Light Reactions: Noncyclic Flow

  12. Light Reactions: Cyclic Flow

  13. Light Reactions: Mechanical Analogy

  14. Chemiosmosis I

  15. Chemiosmosis II

  16. Calvin Cycle

  17. Photorespiration In light, [CO2] while [O2] ; Rubisco adds oxygen to Calvin cycle, releasing useless 2-C compounds.

  18. C4 and CAM Photosynthesis

  19. Photosynthesis: Summary

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